1VERSION = 3 2PATCHLEVEL = 18 3SUBLEVEL = 0 4EXTRAVERSION = -rc3 5NAME = Diseased Newt 6 7# *DOCUMENTATION* 8# To see a list of typical targets execute "make help" 9# More info can be located in ./README 10# Comments in this file are targeted only to the developer, do not 11# expect to learn how to build the kernel reading this file. 12 13# Do not use make's built-in rules and variables 14# (this increases performance and avoids hard-to-debug behaviour); 15MAKEFLAGS += -rR 16 17# Avoid funny character set dependencies 18unexport LC_ALL 19LC_COLLATE=C 20LC_NUMERIC=C 21export LC_COLLATE LC_NUMERIC 22 23# Avoid interference with shell env settings 24unexport GREP_OPTIONS 25 26# We are using a recursive build, so we need to do a little thinking 27# to get the ordering right. 28# 29# Most importantly: sub-Makefiles should only ever modify files in 30# their own directory. If in some directory we have a dependency on 31# a file in another dir (which doesn't happen often, but it's often 32# unavoidable when linking the built-in.o targets which finally 33# turn into vmlinux), we will call a sub make in that other dir, and 34# after that we are sure that everything which is in that other dir 35# is now up to date. 36# 37# The only cases where we need to modify files which have global 38# effects are thus separated out and done before the recursive 39# descending is started. They are now explicitly listed as the 40# prepare rule. 41 42# Beautify output 43# --------------------------------------------------------------------------- 44# 45# Normally, we echo the whole command before executing it. By making 46# that echo $($(quiet)$(cmd)), we now have the possibility to set 47# $(quiet) to choose other forms of output instead, e.g. 48# 49# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ 50# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 51# 52# If $(quiet) is empty, the whole command will be printed. 53# If it is set to "quiet_", only the short version will be printed. 54# If it is set to "silent_", nothing will be printed at all, since 55# the variable $(silent_cmd_cc_o_c) doesn't exist. 56# 57# A simple variant is to prefix commands with $(Q) - that's useful 58# for commands that shall be hidden in non-verbose mode. 59# 60# $(Q)ln $@ :< 61# 62# If KBUILD_VERBOSE equals 0 then the above command will be hidden. 63# If KBUILD_VERBOSE equals 1 then the above command is displayed. 64# 65# To put more focus on warnings, be less verbose as default 66# Use 'make V=1' to see the full commands 67 68ifeq ("$(origin V)", "command line") 69 KBUILD_VERBOSE = $(V) 70endif 71ifndef KBUILD_VERBOSE 72 KBUILD_VERBOSE = 0 73endif 74 75ifeq ($(KBUILD_VERBOSE),1) 76 quiet = 77 Q = 78else 79 quiet=quiet_ 80 Q = @ 81endif 82 83# If the user is running make -s (silent mode), suppress echoing of 84# commands 85 86ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4 87ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),) 88 quiet=silent_ 89endif 90else # make-3.8x 91ifneq ($(filter s% -s%,$(MAKEFLAGS)),) 92 quiet=silent_ 93endif 94endif 95 96export quiet Q KBUILD_VERBOSE 97 98# kbuild supports saving output files in a separate directory. 99# To locate output files in a separate directory two syntaxes are supported. 100# In both cases the working directory must be the root of the kernel src. 101# 1) O= 102# Use "make O=dir/to/store/output/files/" 103# 104# 2) Set KBUILD_OUTPUT 105# Set the environment variable KBUILD_OUTPUT to point to the directory 106# where the output files shall be placed. 107# export KBUILD_OUTPUT=dir/to/store/output/files/ 108# make 109# 110# The O= assignment takes precedence over the KBUILD_OUTPUT environment 111# variable. 112 113# KBUILD_SRC is set on invocation of make in OBJ directory 114# KBUILD_SRC is not intended to be used by the regular user (for now) 115ifeq ($(KBUILD_SRC),) 116 117# OK, Make called in directory where kernel src resides 118# Do we want to locate output files in a separate directory? 119ifeq ("$(origin O)", "command line") 120 KBUILD_OUTPUT := $(O) 121endif 122 123# That's our default target when none is given on the command line 124PHONY := _all 125_all: 126 127# Cancel implicit rules on top Makefile 128$(CURDIR)/Makefile Makefile: ; 129 130ifneq ($(KBUILD_OUTPUT),) 131# Invoke a second make in the output directory, passing relevant variables 132# check that the output directory actually exists 133saved-output := $(KBUILD_OUTPUT) 134KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ 135 && /bin/pwd) 136$(if $(KBUILD_OUTPUT),, \ 137 $(error failed to create output directory "$(saved-output)")) 138 139PHONY += $(MAKECMDGOALS) sub-make 140 141$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make 142 @: 143 144sub-make: FORCE 145 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \ 146 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) 147 148# Leave processing to above invocation of make 149skip-makefile := 1 150endif # ifneq ($(KBUILD_OUTPUT),) 151endif # ifeq ($(KBUILD_SRC),) 152 153# We process the rest of the Makefile if this is the final invocation of make 154ifeq ($(skip-makefile),) 155 156# Do not print "Entering directory ...", 157# but we want to display it when entering to the output directory 158# so that IDEs/editors are able to understand relative filenames. 159MAKEFLAGS += --no-print-directory 160 161# Call a source code checker (by default, "sparse") as part of the 162# C compilation. 163# 164# Use 'make C=1' to enable checking of only re-compiled files. 165# Use 'make C=2' to enable checking of *all* source files, regardless 166# of whether they are re-compiled or not. 167# 168# See the file "Documentation/sparse.txt" for more details, including 169# where to get the "sparse" utility. 170 171ifeq ("$(origin C)", "command line") 172 KBUILD_CHECKSRC = $(C) 173endif 174ifndef KBUILD_CHECKSRC 175 KBUILD_CHECKSRC = 0 176endif 177 178# Use make M=dir to specify directory of external module to build 179# Old syntax make ... SUBDIRS=$PWD is still supported 180# Setting the environment variable KBUILD_EXTMOD take precedence 181ifdef SUBDIRS 182 KBUILD_EXTMOD ?= $(SUBDIRS) 183endif 184 185ifeq ("$(origin M)", "command line") 186 KBUILD_EXTMOD := $(M) 187endif 188 189# If building an external module we do not care about the all: rule 190# but instead _all depend on modules 191PHONY += all 192ifeq ($(KBUILD_EXTMOD),) 193_all: all 194else 195_all: modules 196endif 197 198ifeq ($(KBUILD_SRC),) 199 # building in the source tree 200 srctree := . 201else 202 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR))) 203 # building in a subdirectory of the source tree 204 srctree := .. 205 else 206 srctree := $(KBUILD_SRC) 207 endif 208endif 209objtree := . 210src := $(srctree) 211obj := $(objtree) 212 213VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 214 215export srctree objtree VPATH 216 217 218# SUBARCH tells the usermode build what the underlying arch is. That is set 219# first, and if a usermode build is happening, the "ARCH=um" on the command 220# line overrides the setting of ARCH below. If a native build is happening, 221# then ARCH is assigned, getting whatever value it gets normally, and 222# SUBARCH is subsequently ignored. 223 224SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ 225 -e s/sun4u/sparc64/ \ 226 -e s/arm.*/arm/ -e s/sa110/arm/ \ 227 -e s/s390x/s390/ -e s/parisc64/parisc/ \ 228 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ 229 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ ) 230 231# Cross compiling and selecting different set of gcc/bin-utils 232# --------------------------------------------------------------------------- 233# 234# When performing cross compilation for other architectures ARCH shall be set 235# to the target architecture. (See arch/* for the possibilities). 236# ARCH can be set during invocation of make: 237# make ARCH=ia64 238# Another way is to have ARCH set in the environment. 239# The default ARCH is the host where make is executed. 240 241# CROSS_COMPILE specify the prefix used for all executables used 242# during compilation. Only gcc and related bin-utils executables 243# are prefixed with $(CROSS_COMPILE). 244# CROSS_COMPILE can be set on the command line 245# make CROSS_COMPILE=ia64-linux- 246# Alternatively CROSS_COMPILE can be set in the environment. 247# A third alternative is to store a setting in .config so that plain 248# "make" in the configured kernel build directory always uses that. 249# Default value for CROSS_COMPILE is not to prefix executables 250# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile 251ARCH ?= $(SUBARCH) 252CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%) 253 254# Architecture as present in compile.h 255UTS_MACHINE := $(ARCH) 256SRCARCH := $(ARCH) 257 258# Additional ARCH settings for x86 259ifeq ($(ARCH),i386) 260 SRCARCH := x86 261endif 262ifeq ($(ARCH),x86_64) 263 SRCARCH := x86 264endif 265 266# Additional ARCH settings for sparc 267ifeq ($(ARCH),sparc32) 268 SRCARCH := sparc 269endif 270ifeq ($(ARCH),sparc64) 271 SRCARCH := sparc 272endif 273 274# Additional ARCH settings for sh 275ifeq ($(ARCH),sh64) 276 SRCARCH := sh 277endif 278 279# Additional ARCH settings for tile 280ifeq ($(ARCH),tilepro) 281 SRCARCH := tile 282endif 283ifeq ($(ARCH),tilegx) 284 SRCARCH := tile 285endif 286 287# Where to locate arch specific headers 288hdr-arch := $(SRCARCH) 289 290KCONFIG_CONFIG ?= .config 291export KCONFIG_CONFIG 292 293# SHELL used by kbuild 294CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ 295 else if [ -x /bin/bash ]; then echo /bin/bash; \ 296 else echo sh; fi ; fi) 297 298HOSTCC = gcc 299HOSTCXX = g++ 300HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer 301HOSTCXXFLAGS = -O2 302 303ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1) 304HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \ 305 -Wno-missing-field-initializers -fno-delete-null-pointer-checks 306endif 307 308# Decide whether to build built-in, modular, or both. 309# Normally, just do built-in. 310 311KBUILD_MODULES := 312KBUILD_BUILTIN := 1 313 314# If we have only "make modules", don't compile built-in objects. 315# When we're building modules with modversions, we need to consider 316# the built-in objects during the descend as well, in order to 317# make sure the checksums are up to date before we record them. 318 319ifeq ($(MAKECMDGOALS),modules) 320 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) 321endif 322 323# If we have "make <whatever> modules", compile modules 324# in addition to whatever we do anyway. 325# Just "make" or "make all" shall build modules as well 326 327ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) 328 KBUILD_MODULES := 1 329endif 330 331ifeq ($(MAKECMDGOALS),) 332 KBUILD_MODULES := 1 333endif 334 335export KBUILD_MODULES KBUILD_BUILTIN 336export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD 337 338ifneq ($(CC),) 339ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1) 340COMPILER := clang 341else 342COMPILER := gcc 343endif 344export COMPILER 345endif 346 347# Look for make include files relative to root of kernel src 348MAKEFLAGS += --include-dir=$(srctree) 349 350# We need some generic definitions (do not try to remake the file). 351$(srctree)/scripts/Kbuild.include: ; 352include $(srctree)/scripts/Kbuild.include 353 354# Make variables (CC, etc...) 355AS = $(CROSS_COMPILE)as 356LD = $(CROSS_COMPILE)ld 357CC = $(CROSS_COMPILE)gcc 358CPP = $(CC) -E 359AR = $(CROSS_COMPILE)ar 360NM = $(CROSS_COMPILE)nm 361STRIP = $(CROSS_COMPILE)strip 362OBJCOPY = $(CROSS_COMPILE)objcopy 363OBJDUMP = $(CROSS_COMPILE)objdump 364AWK = awk 365GENKSYMS = scripts/genksyms/genksyms 366INSTALLKERNEL := installkernel 367DEPMOD = /sbin/depmod 368PERL = perl 369PYTHON = python 370CHECK = sparse 371 372CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ 373 -Wbitwise -Wno-return-void $(CF) 374CFLAGS_MODULE = 375AFLAGS_MODULE = 376LDFLAGS_MODULE = 377CFLAGS_KERNEL = 378AFLAGS_KERNEL = 379CFLAGS_GCOV = -fprofile-arcs -ftest-coverage 380 381 382# Use USERINCLUDE when you must reference the UAPI directories only. 383USERINCLUDE := \ 384 -I$(srctree)/arch/$(hdr-arch)/include/uapi \ 385 -Iarch/$(hdr-arch)/include/generated/uapi \ 386 -I$(srctree)/include/uapi \ 387 -Iinclude/generated/uapi \ 388 -include $(srctree)/include/linux/kconfig.h 389 390# Use LINUXINCLUDE when you must reference the include/ directory. 391# Needed to be compatible with the O= option 392LINUXINCLUDE := \ 393 -I$(srctree)/arch/$(hdr-arch)/include \ 394 -Iarch/$(hdr-arch)/include/generated \ 395 $(if $(KBUILD_SRC), -I$(srctree)/include) \ 396 -Iinclude \ 397 $(USERINCLUDE) 398 399KBUILD_CPPFLAGS := -D__KERNEL__ 400 401KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ 402 -fno-strict-aliasing -fno-common \ 403 -Werror-implicit-function-declaration \ 404 -Wno-format-security 405 406KBUILD_AFLAGS_KERNEL := 407KBUILD_CFLAGS_KERNEL := 408KBUILD_AFLAGS := -D__ASSEMBLY__ 409KBUILD_AFLAGS_MODULE := -DMODULE 410KBUILD_CFLAGS_MODULE := -DMODULE 411KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds 412 413# Read KERNELRELEASE from include/config/kernel.release (if it exists) 414KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) 415KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) 416 417export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION 418export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC 419export CPP AR NM STRIP OBJCOPY OBJDUMP 420export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE 421export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS 422 423export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS 424export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV 425export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE 426export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE 427export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL 428export KBUILD_ARFLAGS 429 430# When compiling out-of-tree modules, put MODVERDIR in the module 431# tree rather than in the kernel tree. The kernel tree might 432# even be read-only. 433export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions 434 435# Files to ignore in find ... statements 436 437export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \ 438 -name CVS -o -name .pc -o -name .hg -o -name .git \) \ 439 -prune -o 440export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \ 441 --exclude CVS --exclude .pc --exclude .hg --exclude .git 442 443# =========================================================================== 444# Rules shared between *config targets and build targets 445 446# Basic helpers built in scripts/ 447PHONY += scripts_basic 448scripts_basic: 449 $(Q)$(MAKE) $(build)=scripts/basic 450 $(Q)rm -f .tmp_quiet_recordmcount 451 452# To avoid any implicit rule to kick in, define an empty command. 453scripts/basic/%: scripts_basic ; 454 455PHONY += outputmakefile 456# outputmakefile generates a Makefile in the output directory, if using a 457# separate output directory. This allows convenient use of make in the 458# output directory. 459outputmakefile: 460ifneq ($(KBUILD_SRC),) 461 $(Q)ln -fsn $(srctree) source 462 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ 463 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) 464endif 465 466# Support for using generic headers in asm-generic 467PHONY += asm-generic 468asm-generic: 469 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 470 src=asm obj=arch/$(SRCARCH)/include/generated/asm 471 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ 472 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm 473 474# To make sure we do not include .config for any of the *config targets 475# catch them early, and hand them over to scripts/kconfig/Makefile 476# It is allowed to specify more targets when calling make, including 477# mixing *config targets and build targets. 478# For example 'make oldconfig all'. 479# Detect when mixed targets is specified, and make a second invocation 480# of make so .config is not included in this case either (for *config). 481 482version_h := include/generated/uapi/linux/version.h 483 484no-dot-config-targets := clean mrproper distclean \ 485 cscope gtags TAGS tags help %docs check% coccicheck \ 486 $(version_h) headers_% archheaders archscripts \ 487 kernelversion %src-pkg 488 489config-targets := 0 490mixed-targets := 0 491dot-config := 1 492 493ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) 494 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) 495 dot-config := 0 496 endif 497endif 498 499ifeq ($(KBUILD_EXTMOD),) 500 ifneq ($(filter config %config,$(MAKECMDGOALS)),) 501 config-targets := 1 502 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),) 503 mixed-targets := 1 504 endif 505 endif 506endif 507 508ifeq ($(mixed-targets),1) 509# =========================================================================== 510# We're called with mixed targets (*config and build targets). 511# Handle them one by one. 512 513PHONY += $(MAKECMDGOALS) __build_one_by_one 514 515$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one 516 @: 517 518__build_one_by_one: 519 $(Q)set -e; \ 520 for i in $(MAKECMDGOALS); do \ 521 $(MAKE) -f $(srctree)/Makefile $$i; \ 522 done 523 524else 525ifeq ($(config-targets),1) 526# =========================================================================== 527# *config targets only - make sure prerequisites are updated, and descend 528# in scripts/kconfig to make the *config target 529 530# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. 531# KBUILD_DEFCONFIG may point out an alternative default configuration 532# used for 'make defconfig' 533include $(srctree)/arch/$(SRCARCH)/Makefile 534export KBUILD_DEFCONFIG KBUILD_KCONFIG 535 536config: scripts_basic outputmakefile FORCE 537 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 538 539%config: scripts_basic outputmakefile FORCE 540 $(Q)$(MAKE) $(build)=scripts/kconfig $@ 541 542else 543# =========================================================================== 544# Build targets only - this includes vmlinux, arch specific targets, clean 545# targets and others. In general all targets except *config targets. 546 547ifeq ($(KBUILD_EXTMOD),) 548# Additional helpers built in scripts/ 549# Carefully list dependencies so we do not try to build scripts twice 550# in parallel 551PHONY += scripts 552scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \ 553 asm-generic 554 $(Q)$(MAKE) $(build)=$(@) 555 556# Objects we will link into vmlinux / subdirs we need to visit 557init-y := init/ 558drivers-y := drivers/ sound/ firmware/ 559net-y := net/ 560libs-y := lib/ 561core-y := usr/ 562endif # KBUILD_EXTMOD 563 564ifeq ($(dot-config),1) 565# Read in config 566-include include/config/auto.conf 567 568ifeq ($(KBUILD_EXTMOD),) 569# Read in dependencies to all Kconfig* files, make sure to run 570# oldconfig if changes are detected. 571-include include/config/auto.conf.cmd 572 573# To avoid any implicit rule to kick in, define an empty command 574$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; 575 576# If .config is newer than include/config/auto.conf, someone tinkered 577# with it and forgot to run make oldconfig. 578# if auto.conf.cmd is missing then we are probably in a cleaned tree so 579# we execute the config step to be sure to catch updated Kconfig files 580include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd 581 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig 582else 583# external modules needs include/generated/autoconf.h and include/config/auto.conf 584# but do not care if they are up-to-date. Use auto.conf to trigger the test 585PHONY += include/config/auto.conf 586 587include/config/auto.conf: 588 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \ 589 echo >&2; \ 590 echo >&2 " ERROR: Kernel configuration is invalid."; \ 591 echo >&2 " include/generated/autoconf.h or $@ are missing.";\ 592 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \ 593 echo >&2 ; \ 594 /bin/false) 595 596endif # KBUILD_EXTMOD 597 598else 599# Dummy target needed, because used as prerequisite 600include/config/auto.conf: ; 601endif # $(dot-config) 602 603# The all: target is the default when no target is given on the 604# command line. 605# This allow a user to issue only 'make' to build a kernel including modules 606# Defaults to vmlinux, but the arch makefile usually adds further targets 607all: vmlinux 608 609include $(srctree)/arch/$(SRCARCH)/Makefile 610 611KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) 612 613ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE 614KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,) 615else 616KBUILD_CFLAGS += -O2 617endif 618 619# Tell gcc to never replace conditional load with a non-conditional one 620KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) 621 622ifdef CONFIG_READABLE_ASM 623# Disable optimizations that make assembler listings hard to read. 624# reorder blocks reorders the control in the function 625# ipa clone creates specialized cloned functions 626# partial inlining inlines only parts of functions 627KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \ 628 $(call cc-option,-fno-ipa-cp-clone,) \ 629 $(call cc-option,-fno-partial-inlining) 630endif 631 632ifneq ($(CONFIG_FRAME_WARN),0) 633KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN}) 634endif 635 636# Handle stack protector mode. 637# 638# Since kbuild can potentially perform two passes (first with the old 639# .config values and then with updated .config values), we cannot error out 640# if a desired compiler option is unsupported. If we were to error, kbuild 641# could never get to the second pass and actually notice that we changed 642# the option to something that was supported. 643# 644# Additionally, we don't want to fallback and/or silently change which compiler 645# flags will be used, since that leads to producing kernels with different 646# security feature characteristics depending on the compiler used. ("But I 647# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!") 648# 649# The middle ground is to warn here so that the failed option is obvious, but 650# to let the build fail with bad compiler flags so that we can't produce a 651# kernel when there is a CONFIG and compiler mismatch. 652# 653ifdef CONFIG_CC_STACKPROTECTOR_REGULAR 654 stackp-flag := -fstack-protector 655 ifeq ($(call cc-option, $(stackp-flag)),) 656 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \ 657 -fstack-protector not supported by compiler) 658 endif 659else 660ifdef CONFIG_CC_STACKPROTECTOR_STRONG 661 stackp-flag := -fstack-protector-strong 662 ifeq ($(call cc-option, $(stackp-flag)),) 663 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \ 664 -fstack-protector-strong not supported by compiler) 665 endif 666else 667 # Force off for distro compilers that enable stack protector by default. 668 stackp-flag := $(call cc-option, -fno-stack-protector) 669endif 670endif 671KBUILD_CFLAGS += $(stackp-flag) 672 673ifeq ($(COMPILER),clang) 674KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,) 675KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,) 676KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable) 677KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier) 678KBUILD_CFLAGS += $(call cc-disable-warning, gnu) 679# Quiet clang warning: comparison of unsigned expression < 0 is always false 680KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare) 681# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the 682# source of a reference will be _MergedGlobals and not on of the whitelisted names. 683# See modpost pattern 2 684KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,) 685KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior) 686else 687 688# This warning generated too much noise in a regular build. 689# Use make W=1 to enable this warning (see scripts/Makefile.build) 690KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable) 691endif 692 693ifdef CONFIG_FRAME_POINTER 694KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls 695else 696# Some targets (ARM with Thumb2, for example), can't be built with frame 697# pointers. For those, we don't have FUNCTION_TRACER automatically 698# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is 699# incompatible with -fomit-frame-pointer with current GCC, so we don't use 700# -fomit-frame-pointer with FUNCTION_TRACER. 701ifndef CONFIG_FUNCTION_TRACER 702KBUILD_CFLAGS += -fomit-frame-pointer 703endif 704endif 705 706KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments) 707 708ifdef CONFIG_DEBUG_INFO 709ifdef CONFIG_DEBUG_INFO_SPLIT 710KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g) 711else 712KBUILD_CFLAGS += -g 713endif 714KBUILD_AFLAGS += -Wa,-gdwarf-2 715endif 716ifdef CONFIG_DEBUG_INFO_DWARF4 717KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,) 718endif 719 720ifdef CONFIG_DEBUG_INFO_REDUCED 721KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \ 722 $(call cc-option,-fno-var-tracking) 723endif 724 725ifdef CONFIG_FUNCTION_TRACER 726ifdef CONFIG_HAVE_FENTRY 727CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY) 728endif 729KBUILD_CFLAGS += -pg $(CC_USING_FENTRY) 730KBUILD_AFLAGS += $(CC_USING_FENTRY) 731ifdef CONFIG_DYNAMIC_FTRACE 732 ifdef CONFIG_HAVE_C_RECORDMCOUNT 733 BUILD_C_RECORDMCOUNT := y 734 export BUILD_C_RECORDMCOUNT 735 endif 736endif 737endif 738 739# We trigger additional mismatches with less inlining 740ifdef CONFIG_DEBUG_SECTION_MISMATCH 741KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) 742endif 743 744# arch Makefile may override CC so keep this after arch Makefile is included 745NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) 746CHECKFLAGS += $(NOSTDINC_FLAGS) 747 748# warn about C99 declaration after statement 749KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) 750 751# disable pointer signed / unsigned warnings in gcc 4.0 752KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign) 753 754# disable invalid "can't wrap" optimizations for signed / pointers 755KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) 756 757# conserve stack if available 758KBUILD_CFLAGS += $(call cc-option,-fconserve-stack) 759 760# disallow errors like 'EXPORT_GPL(foo);' with missing header 761KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int) 762 763# require functions to have arguments in prototypes, not empty 'int foo()' 764KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) 765 766# Prohibit date/time macros, which would make the build non-deterministic 767KBUILD_CFLAGS += $(call cc-option,-Werror=date-time) 768 769# use the deterministic mode of AR if available 770KBUILD_ARFLAGS := $(call ar-option,D) 771 772# check for 'asm goto' 773ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y) 774 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO 775endif 776 777include $(srctree)/scripts/Makefile.extrawarn 778 779# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments 780KBUILD_CPPFLAGS += $(KCPPFLAGS) 781KBUILD_AFLAGS += $(KAFLAGS) 782KBUILD_CFLAGS += $(KCFLAGS) 783 784# Use --build-id when available. 785LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\ 786 $(call cc-ldoption, -Wl$(comma)--build-id,)) 787KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) 788LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) 789 790ifeq ($(CONFIG_STRIP_ASM_SYMS),y) 791LDFLAGS_vmlinux += $(call ld-option, -X,) 792endif 793 794# Default kernel image to build when no specific target is given. 795# KBUILD_IMAGE may be overruled on the command line or 796# set in the environment 797# Also any assignments in arch/$(ARCH)/Makefile take precedence over 798# this default value 799export KBUILD_IMAGE ?= vmlinux 800 801# 802# INSTALL_PATH specifies where to place the updated kernel and system map 803# images. Default is /boot, but you can set it to other values 804export INSTALL_PATH ?= /boot 805 806# 807# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. 808# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as 809# an argument if needed. Otherwise it defaults to the kernel install path 810# 811export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) 812 813# 814# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory 815# relocations required by build roots. This is not defined in the 816# makefile but the argument can be passed to make if needed. 817# 818 819MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) 820export MODLIB 821 822# 823# INSTALL_MOD_STRIP, if defined, will cause modules to be 824# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then 825# the default option --strip-debug will be used. Otherwise, 826# INSTALL_MOD_STRIP value will be used as the options to the strip command. 827 828ifdef INSTALL_MOD_STRIP 829ifeq ($(INSTALL_MOD_STRIP),1) 830mod_strip_cmd = $(STRIP) --strip-debug 831else 832mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP) 833endif # INSTALL_MOD_STRIP=1 834else 835mod_strip_cmd = true 836endif # INSTALL_MOD_STRIP 837export mod_strip_cmd 838 839# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed 840# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP 841# or CONFIG_MODULE_COMPRESS_XZ. 842 843mod_compress_cmd = true 844ifdef CONFIG_MODULE_COMPRESS 845 ifdef CONFIG_MODULE_COMPRESS_GZIP 846 mod_compress_cmd = gzip -n 847 endif # CONFIG_MODULE_COMPRESS_GZIP 848 ifdef CONFIG_MODULE_COMPRESS_XZ 849 mod_compress_cmd = xz 850 endif # CONFIG_MODULE_COMPRESS_XZ 851endif # CONFIG_MODULE_COMPRESS 852export mod_compress_cmd 853 854# Select initial ramdisk compression format, default is gzip(1). 855# This shall be used by the dracut(8) tool while creating an initramfs image. 856# 857INITRD_COMPRESS-y := gzip 858INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2 859INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma 860INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz 861INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo 862INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4 863# do not export INITRD_COMPRESS, since we didn't actually 864# choose a sane default compression above. 865# export INITRD_COMPRESS := $(INITRD_COMPRESS-y) 866 867ifdef CONFIG_MODULE_SIG_ALL 868MODSECKEY = ./signing_key.priv 869MODPUBKEY = ./signing_key.x509 870export MODPUBKEY 871mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY) 872else 873mod_sign_cmd = true 874endif 875export mod_sign_cmd 876 877 878ifeq ($(KBUILD_EXTMOD),) 879core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ 880 881vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \ 882 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \ 883 $(net-y) $(net-m) $(libs-y) $(libs-m))) 884 885vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \ 886 $(init-) $(core-) $(drivers-) $(net-) $(libs-)))) 887 888init-y := $(patsubst %/, %/built-in.o, $(init-y)) 889core-y := $(patsubst %/, %/built-in.o, $(core-y)) 890drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y)) 891net-y := $(patsubst %/, %/built-in.o, $(net-y)) 892libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) 893libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y)) 894libs-y := $(libs-y1) $(libs-y2) 895 896# Externally visible symbols (used by link-vmlinux.sh) 897export KBUILD_VMLINUX_INIT := $(head-y) $(init-y) 898export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) 899export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 900export LDFLAGS_vmlinux 901# used by scripts/pacmage/Makefile 902export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt) 903 904vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) 905 906# Final link of vmlinux 907 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) 908quiet_cmd_link-vmlinux = LINK $@ 909 910# Include targets which we want to 911# execute if the rest of the kernel build went well. 912vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE 913ifdef CONFIG_HEADERS_CHECK 914 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check 915endif 916ifdef CONFIG_SAMPLES 917 $(Q)$(MAKE) $(build)=samples 918endif 919ifdef CONFIG_BUILD_DOCSRC 920 $(Q)$(MAKE) $(build)=Documentation 921endif 922 +$(call if_changed,link-vmlinux) 923 924# The actual objects are generated when descending, 925# make sure no implicit rule kicks in 926$(sort $(vmlinux-deps)): $(vmlinux-dirs) ; 927 928# Handle descending into subdirectories listed in $(vmlinux-dirs) 929# Preset locale variables to speed up the build process. Limit locale 930# tweaks to this spot to avoid wrong language settings when running 931# make menuconfig etc. 932# Error messages still appears in the original language 933 934PHONY += $(vmlinux-dirs) 935$(vmlinux-dirs): prepare scripts 936 $(Q)$(MAKE) $(build)=$@ 937 938define filechk_kernel.release 939 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 940endef 941 942# Store (new) KERNELRELEASE string in include/config/kernel.release 943include/config/kernel.release: include/config/auto.conf FORCE 944 $(call filechk,kernel.release) 945 946 947# Things we need to do before we recursively start building the kernel 948# or the modules are listed in "prepare". 949# A multi level approach is used. prepareN is processed before prepareN-1. 950# archprepare is used in arch Makefiles and when processed asm symlink, 951# version.h and scripts_basic is processed / created. 952 953# Listed in dependency order 954PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 955 956# prepare3 is used to check if we are building in a separate output directory, 957# and if so do: 958# 1) Check that make has not been executed in the kernel src $(srctree) 959prepare3: include/config/kernel.release 960ifneq ($(KBUILD_SRC),) 961 @$(kecho) ' Using $(srctree) as source for kernel' 962 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ 963 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ 964 echo >&2 " in the '$(srctree)' directory.";\ 965 /bin/false; \ 966 fi; 967endif 968 969# prepare2 creates a makefile if using a separate output directory 970prepare2: prepare3 outputmakefile asm-generic 971 972prepare1: prepare2 $(version_h) include/generated/utsrelease.h \ 973 include/config/auto.conf 974 $(cmd_crmodverdir) 975 976archprepare: archheaders archscripts prepare1 scripts_basic 977 978prepare0: archprepare FORCE 979 $(Q)$(MAKE) $(build)=. 980 981# All the preparing.. 982prepare: prepare0 983 984# Generate some files 985# --------------------------------------------------------------------------- 986 987# KERNELRELEASE can change from a few different places, meaning version.h 988# needs to be updated, so this check is forced on all builds 989 990uts_len := 64 991define filechk_utsrelease.h 992 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ 993 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ 994 exit 1; \ 995 fi; \ 996 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) 997endef 998 999define filechk_version.h 1000 (echo \#define LINUX_VERSION_CODE $(shell \ 1001 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \ 1002 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) 1003endef 1004 1005$(version_h): $(srctree)/Makefile FORCE 1006 $(call filechk,version.h) 1007 1008include/generated/utsrelease.h: include/config/kernel.release FORCE 1009 $(call filechk,utsrelease.h) 1010 1011PHONY += headerdep 1012headerdep: 1013 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ 1014 $(srctree)/scripts/headerdep.pl -I$(srctree)/include 1015 1016# --------------------------------------------------------------------------- 1017 1018PHONY += depend dep 1019depend dep: 1020 @echo '*** Warning: make $@ is unnecessary now.' 1021 1022# --------------------------------------------------------------------------- 1023# Firmware install 1024INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware 1025export INSTALL_FW_PATH 1026 1027PHONY += firmware_install 1028firmware_install: FORCE 1029 @mkdir -p $(objtree)/firmware 1030 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install 1031 1032# --------------------------------------------------------------------------- 1033# Kernel headers 1034 1035#Default location for installed headers 1036export INSTALL_HDR_PATH = $(objtree)/usr 1037 1038hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj 1039 1040# If we do an all arch process set dst to asm-$(hdr-arch) 1041hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm) 1042 1043PHONY += archheaders 1044archheaders: 1045 1046PHONY += archscripts 1047archscripts: 1048 1049PHONY += __headers 1050__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE 1051 $(Q)$(MAKE) $(build)=scripts build_unifdef 1052 1053PHONY += headers_install_all 1054headers_install_all: 1055 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install 1056 1057PHONY += headers_install 1058headers_install: __headers 1059 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \ 1060 $(error Headers not exportable for the $(SRCARCH) architecture)) 1061 $(Q)$(MAKE) $(hdr-inst)=include/uapi 1062 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) 1063 1064PHONY += headers_check_all 1065headers_check_all: headers_install_all 1066 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check 1067 1068PHONY += headers_check 1069headers_check: headers_install 1070 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1 1071 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1 1072 1073# --------------------------------------------------------------------------- 1074# Kernel selftest 1075 1076PHONY += kselftest 1077kselftest: 1078 $(Q)$(MAKE) -C tools/testing/selftests run_tests 1079 1080# --------------------------------------------------------------------------- 1081# Modules 1082 1083ifdef CONFIG_MODULES 1084 1085# By default, build modules as well 1086 1087all: modules 1088 1089# Build modules 1090# 1091# A module can be listed more than once in obj-m resulting in 1092# duplicate lines in modules.order files. Those are removed 1093# using awk while concatenating to the final file. 1094 1095PHONY += modules 1096modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin 1097 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order 1098 @$(kecho) ' Building modules, stage 2.'; 1099 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1100 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild 1101 1102modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) 1103 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin 1104 1105%/modules.builtin: include/config/auto.conf 1106 $(Q)$(MAKE) $(modbuiltin)=$* 1107 1108 1109# Target to prepare building external modules 1110PHONY += modules_prepare 1111modules_prepare: prepare scripts 1112 1113# Target to install modules 1114PHONY += modules_install 1115modules_install: _modinst_ _modinst_post 1116 1117PHONY += _modinst_ 1118_modinst_: 1119 @rm -rf $(MODLIB)/kernel 1120 @rm -f $(MODLIB)/source 1121 @mkdir -p $(MODLIB)/kernel 1122 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source 1123 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ 1124 rm -f $(MODLIB)/build ; \ 1125 ln -s $(CURDIR) $(MODLIB)/build ; \ 1126 fi 1127 @cp -f $(objtree)/modules.order $(MODLIB)/ 1128 @cp -f $(objtree)/modules.builtin $(MODLIB)/ 1129 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1130 1131# This depmod is only for convenience to give the initial 1132# boot a modules.dep even before / is mounted read-write. However the 1133# boot script depmod is the master version. 1134PHONY += _modinst_post 1135_modinst_post: _modinst_ 1136 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst 1137 $(call cmd,depmod) 1138 1139ifeq ($(CONFIG_MODULE_SIG), y) 1140PHONY += modules_sign 1141modules_sign: 1142 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign 1143endif 1144 1145else # CONFIG_MODULES 1146 1147# Modules not configured 1148# --------------------------------------------------------------------------- 1149 1150modules modules_install: FORCE 1151 @echo >&2 1152 @echo >&2 "The present kernel configuration has modules disabled." 1153 @echo >&2 "Type 'make config' and enable loadable module support." 1154 @echo >&2 "Then build a kernel with module support enabled." 1155 @echo >&2 1156 @exit 1 1157 1158endif # CONFIG_MODULES 1159 1160### 1161# Cleaning is done on three levels. 1162# make clean Delete most generated files 1163# Leave enough to build external modules 1164# make mrproper Delete the current configuration, and all generated files 1165# make distclean Remove editor backup files, patch leftover files and the like 1166 1167# Directories & files removed with 'make clean' 1168CLEAN_DIRS += $(MODVERDIR) 1169 1170# Directories & files removed with 'make mrproper' 1171MRPROPER_DIRS += include/config usr/include include/generated \ 1172 arch/*/include/generated .tmp_objdiff 1173MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \ 1174 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ 1175 signing_key.priv signing_key.x509 x509.genkey \ 1176 extra_certificates signing_key.x509.keyid \ 1177 signing_key.x509.signer include/linux/version.h 1178 1179# clean - Delete most, but leave enough to build external modules 1180# 1181clean: rm-dirs := $(CLEAN_DIRS) 1182clean: rm-files := $(CLEAN_FILES) 1183clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) 1184 1185PHONY += $(clean-dirs) clean archclean vmlinuxclean 1186$(clean-dirs): 1187 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1188 1189vmlinuxclean: 1190 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean 1191 1192clean: archclean vmlinuxclean 1193 1194# mrproper - Delete all generated files, including .config 1195# 1196mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) 1197mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) 1198mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts) 1199 1200PHONY += $(mrproper-dirs) mrproper archmrproper 1201$(mrproper-dirs): 1202 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) 1203 1204mrproper: clean archmrproper $(mrproper-dirs) 1205 $(call cmd,rmdirs) 1206 $(call cmd,rmfiles) 1207 1208# distclean 1209# 1210PHONY += distclean 1211 1212distclean: mrproper 1213 @find $(srctree) $(RCS_FIND_IGNORE) \ 1214 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ 1215 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ 1216 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \ 1217 -type f -print | xargs rm -f 1218 1219 1220# Packaging of the kernel to various formats 1221# --------------------------------------------------------------------------- 1222# rpm target kept for backward compatibility 1223package-dir := scripts/package 1224 1225%src-pkg: FORCE 1226 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1227%pkg: include/config/kernel.release FORCE 1228 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1229rpm: include/config/kernel.release FORCE 1230 $(Q)$(MAKE) $(build)=$(package-dir) $@ 1231 1232 1233# Brief documentation of the typical targets used 1234# --------------------------------------------------------------------------- 1235 1236boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) 1237boards := $(notdir $(boards)) 1238board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) 1239board-dirs := $(sort $(notdir $(board-dirs:/=))) 1240 1241help: 1242 @echo 'Cleaning targets:' 1243 @echo ' clean - Remove most generated files but keep the config and' 1244 @echo ' enough build support to build external modules' 1245 @echo ' mrproper - Remove all generated files + config + various backup files' 1246 @echo ' distclean - mrproper + remove editor backup and patch files' 1247 @echo '' 1248 @echo 'Configuration targets:' 1249 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help 1250 @echo '' 1251 @echo 'Other generic targets:' 1252 @echo ' all - Build all targets marked with [*]' 1253 @echo '* vmlinux - Build the bare kernel' 1254 @echo '* modules - Build all modules' 1255 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' 1256 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH' 1257 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' 1258 @echo ' dir/ - Build all files in dir and below' 1259 @echo ' dir/file.[oisS] - Build specified target only' 1260 @echo ' dir/file.lst - Build specified mixed source/assembly target only' 1261 @echo ' (requires a recent binutils and recent build (System.map))' 1262 @echo ' dir/file.ko - Build module including final link' 1263 @echo ' modules_prepare - Set up for building external modules' 1264 @echo ' tags/TAGS - Generate tags file for editors' 1265 @echo ' cscope - Generate cscope index' 1266 @echo ' gtags - Generate GNU GLOBAL index' 1267 @echo ' kernelrelease - Output the release version string (use with make -s)' 1268 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)' 1269 @echo ' image_name - Output the image name (use with make -s)' 1270 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ 1271 echo ' (default: $(INSTALL_HDR_PATH))'; \ 1272 echo '' 1273 @echo 'Static analysers' 1274 @echo ' checkstack - Generate a list of stack hogs' 1275 @echo ' namespacecheck - Name space analysis on compiled kernel' 1276 @echo ' versioncheck - Sanity check on version.h usage' 1277 @echo ' includecheck - Check for duplicate included header files' 1278 @echo ' export_report - List the usages of all exported symbols' 1279 @echo ' headers_check - Sanity check on exported headers' 1280 @echo ' headerdep - Detect inclusion cycles in headers' 1281 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help 1282 @echo '' 1283 @echo 'Kernel selftest' 1284 @echo ' kselftest - Build and run kernel selftest (run as root)' 1285 @echo ' Build, install, and boot kernel before' 1286 @echo ' running kselftest on it' 1287 @echo '' 1288 @echo 'Kernel packaging:' 1289 @$(MAKE) $(build)=$(package-dir) help 1290 @echo '' 1291 @echo 'Documentation targets:' 1292 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp 1293 @echo '' 1294 @echo 'Architecture specific targets ($(SRCARCH)):' 1295 @$(if $(archhelp),$(archhelp),\ 1296 echo ' No architecture specific help defined for $(SRCARCH)') 1297 @echo '' 1298 @$(if $(boards), \ 1299 $(foreach b, $(boards), \ 1300 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ 1301 echo '') 1302 @$(if $(board-dirs), \ 1303 $(foreach b, $(board-dirs), \ 1304 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \ 1305 printf " %-16s - Show all of the above\\n" help-boards; \ 1306 echo '') 1307 1308 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' 1309 @echo ' make V=2 [targets] 2 => give reason for rebuild of target' 1310 @echo ' make O=dir [targets] Locate all output files in "dir", including .config' 1311 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' 1312 @echo ' make C=2 [targets] Force check of all c source with $$CHECK' 1313 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' 1314 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where' 1315 @echo ' 1: warnings which may be relevant and do not occur too often' 1316 @echo ' 2: warnings which occur quite often but may still be relevant' 1317 @echo ' 3: more obscure warnings, can most likely be ignored' 1318 @echo ' Multiple levels can be combined with W=12 or W=123' 1319 @echo '' 1320 @echo 'Execute "make" or "make all" to build all targets marked with [*] ' 1321 @echo 'For further info see the ./README file' 1322 1323 1324help-board-dirs := $(addprefix help-,$(board-dirs)) 1325 1326help-boards: $(help-board-dirs) 1327 1328boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)) 1329 1330$(help-board-dirs): help-%: 1331 @echo 'Architecture specific targets ($(SRCARCH) $*):' 1332 @$(if $(boards-per-dir), \ 1333 $(foreach b, $(boards-per-dir), \ 1334 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \ 1335 echo '') 1336 1337 1338# Documentation targets 1339# --------------------------------------------------------------------------- 1340%docs: scripts_basic FORCE 1341 $(Q)$(MAKE) $(build)=scripts build_docproc 1342 $(Q)$(MAKE) $(build)=Documentation/DocBook $@ 1343 1344else # KBUILD_EXTMOD 1345 1346### 1347# External module support. 1348# When building external modules the kernel used as basis is considered 1349# read-only, and no consistency checks are made and the make 1350# system is not used on the basis kernel. If updates are required 1351# in the basis kernel ordinary make commands (without M=...) must 1352# be used. 1353# 1354# The following are the only valid targets when building external 1355# modules. 1356# make M=dir clean Delete all automatically generated files 1357# make M=dir modules Make all modules in specified dir 1358# make M=dir Same as 'make M=dir modules' 1359# make M=dir modules_install 1360# Install the modules built in the module directory 1361# Assumes install directory is already created 1362 1363# We are always building modules 1364KBUILD_MODULES := 1 1365PHONY += crmodverdir 1366crmodverdir: 1367 $(cmd_crmodverdir) 1368 1369PHONY += $(objtree)/Module.symvers 1370$(objtree)/Module.symvers: 1371 @test -e $(objtree)/Module.symvers || ( \ 1372 echo; \ 1373 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \ 1374 echo " is missing; modules will have no dependencies and modversions."; \ 1375 echo ) 1376 1377module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD)) 1378PHONY += $(module-dirs) modules 1379$(module-dirs): crmodverdir $(objtree)/Module.symvers 1380 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) 1381 1382modules: $(module-dirs) 1383 @$(kecho) ' Building modules, stage 2.'; 1384 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1385 1386PHONY += modules_install 1387modules_install: _emodinst_ _emodinst_post 1388 1389install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) 1390PHONY += _emodinst_ 1391_emodinst_: 1392 $(Q)mkdir -p $(MODLIB)/$(install-dir) 1393 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst 1394 1395PHONY += _emodinst_post 1396_emodinst_post: _emodinst_ 1397 $(call cmd,depmod) 1398 1399clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) 1400 1401PHONY += $(clean-dirs) clean 1402$(clean-dirs): 1403 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) 1404 1405clean: rm-dirs := $(MODVERDIR) 1406clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers 1407 1408help: 1409 @echo ' Building external modules.' 1410 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target' 1411 @echo '' 1412 @echo ' modules - default target, build the module(s)' 1413 @echo ' modules_install - install the module' 1414 @echo ' clean - remove generated files in module directory only' 1415 @echo '' 1416 1417# Dummies... 1418PHONY += prepare scripts 1419prepare: ; 1420scripts: ; 1421endif # KBUILD_EXTMOD 1422 1423clean: $(clean-dirs) 1424 $(call cmd,rmdirs) 1425 $(call cmd,rmfiles) 1426 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ 1427 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ 1428 -o -name '*.ko.*' \ 1429 -o -name '*.dwo' \ 1430 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ 1431 -o -name '*.symtypes' -o -name 'modules.order' \ 1432 -o -name modules.builtin -o -name '.tmp_*.o.*' \ 1433 -o -name '*.gcno' \) -type f -print | xargs rm -f 1434 1435# Generate tags for editors 1436# --------------------------------------------------------------------------- 1437quiet_cmd_tags = GEN $@ 1438 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ 1439 1440tags TAGS cscope gtags: FORCE 1441 $(call cmd,tags) 1442 1443# Scripts to check various things for consistency 1444# --------------------------------------------------------------------------- 1445 1446PHONY += includecheck versioncheck coccicheck namespacecheck export_report 1447 1448includecheck: 1449 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1450 -name '*.[hcS]' -type f -print | sort \ 1451 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl 1452 1453versioncheck: 1454 find $(srctree)/* $(RCS_FIND_IGNORE) \ 1455 -name '*.[hcS]' -type f -print | sort \ 1456 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl 1457 1458coccicheck: 1459 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ 1460 1461namespacecheck: 1462 $(PERL) $(srctree)/scripts/namespace.pl 1463 1464export_report: 1465 $(PERL) $(srctree)/scripts/export_report.pl 1466 1467endif #ifeq ($(config-targets),1) 1468endif #ifeq ($(mixed-targets),1) 1469 1470PHONY += checkstack kernelrelease kernelversion image_name 1471 1472# UML needs a little special treatment here. It wants to use the host 1473# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone 1474# else wants $(ARCH), including people doing cross-builds, which means 1475# that $(SUBARCH) doesn't work here. 1476ifeq ($(ARCH), um) 1477CHECKSTACK_ARCH := $(SUBARCH) 1478else 1479CHECKSTACK_ARCH := $(ARCH) 1480endif 1481checkstack: 1482 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ 1483 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) 1484 1485kernelrelease: 1486 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" 1487 1488kernelversion: 1489 @echo $(KERNELVERSION) 1490 1491image_name: 1492 @echo $(KBUILD_IMAGE) 1493 1494# Clear a bunch of variables before executing the submake 1495tools/: FORCE 1496 $(Q)mkdir -p $(objtree)/tools 1497 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ 1498 1499tools/%: FORCE 1500 $(Q)mkdir -p $(objtree)/tools 1501 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $* 1502 1503# Single targets 1504# --------------------------------------------------------------------------- 1505# Single targets are compatible with: 1506# - build with mixed source and output 1507# - build with separate output dir 'make O=...' 1508# - external modules 1509# 1510# target-dir => where to store outputfile 1511# build-dir => directory in kernel source tree to use 1512 1513ifeq ($(KBUILD_EXTMOD),) 1514 build-dir = $(patsubst %/,%,$(dir $@)) 1515 target-dir = $(dir $@) 1516else 1517 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@))) 1518 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash)) 1519 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@)) 1520endif 1521 1522%.s: %.c prepare scripts FORCE 1523 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1524%.i: %.c prepare scripts FORCE 1525 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1526%.o: %.c prepare scripts FORCE 1527 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1528%.lst: %.c prepare scripts FORCE 1529 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1530%.s: %.S prepare scripts FORCE 1531 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1532%.o: %.S prepare scripts FORCE 1533 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1534%.symtypes: %.c prepare scripts FORCE 1535 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) 1536 1537# Modules 1538/: prepare scripts FORCE 1539 $(cmd_crmodverdir) 1540 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1541 $(build)=$(build-dir) 1542# Make sure the latest headers are built for Documentation 1543Documentation/: headers_install 1544%/: prepare scripts FORCE 1545 $(cmd_crmodverdir) 1546 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1547 $(build)=$(build-dir) 1548%.ko: prepare scripts FORCE 1549 $(cmd_crmodverdir) 1550 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ 1551 $(build)=$(build-dir) $(@:.ko=.o) 1552 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost 1553 1554# FIXME Should go into a make.lib or something 1555# =========================================================================== 1556 1557quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) 1558 cmd_rmdirs = rm -rf $(rm-dirs) 1559 1560quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) 1561 cmd_rmfiles = rm -f $(rm-files) 1562 1563# Run depmod only if we have System.map and depmod is executable 1564quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) 1565 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ 1566 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))" 1567 1568# Create temporary dir for module support files 1569# clean it up only when building all modules 1570cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ 1571 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) 1572 1573# read all saved command lines 1574 1575targets := $(wildcard $(sort $(targets))) 1576cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 1577 1578ifneq ($(cmd_files),) 1579 $(cmd_files): ; # Do not try to update included dependency files 1580 include $(cmd_files) 1581endif 1582 1583# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir 1584# Usage: 1585# $(Q)$(MAKE) $(clean)=dir 1586clean := -f $(srctree)/scripts/Makefile.clean obj 1587 1588endif # skip-makefile 1589 1590PHONY += FORCE 1591FORCE: 1592 1593# Declare the contents of the .PHONY variable as phony. We keep that 1594# information in a variable so we can use it in if_changed and friends. 1595.PHONY: $(PHONY) 1596